﻿//-----------------------------------------------------------------------
// <copyright file="GDICamera.cs" company="Nathan Miller">
// Copyright (c) Nathan Miller.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
//-----------------------------------------------------------------------
namespace TileTool.Base.Render
{
    using System;
    using TileTool.Common.Math;
    using TileTool.Render;

    /// <summary>
    /// Camera for GDI rendering.
    /// </summary>
    public class GDICamera : ICamera
    {
        #region Constructor

        /// <summary>
        /// Constructor for the camera.
        /// </summary>
        /// <param name="canvas">Canvas the camera is in.</param>
        public GDICamera(ICanvas canvas)
        {
            if (canvas == null)
            {
                throw new ArgumentNullException("canvas", "Canvas must be non-null.");
            }

            this.Canvas = canvas;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets the camera's position.
        /// </summary>
        public Vector2D Position
        {
            get;
            set;
        }

        /// <summary>
        /// Gets the rect that represents the bounds of the camera.
        /// </summary>
        public Rect2D Rect
        {
            get
            {
                Rect2D res = new Rect2D();
                float halfWidth = this.Canvas.Width * 0.5f;
                float halfHeight = this.Canvas.Height * 0.5f;

                res.Pos = new Vector2D(this.Position.x - halfWidth, this.Position.y - halfHeight);
                res.Width = this.Canvas.Width;
                res.Height = this.Canvas.Height;

                return res;
            }
        }

        /// <summary>
        /// Gets the camera's matrix.
        /// </summary>
        public Matrix2D Matrix
        {
            get
            {
                Matrix2D res = new Matrix2D();

                res.BuildTranslate(this.Position);

                return res;
            }
        }

        /// <summary>
        /// Gets the canvas we are in.
        /// </summary>
        public ICanvas Canvas
        {
            get;
            private set;
        }

        #endregion
    }
}
